1918 Remington Mark 1 Pedersen Device

The Pedersen Device is an attachment developed during World War I for the M1903 Springfield rifle that allowed it to fire a short 0.30 (7.62 mm) caliber intermediate cartridge in semi-automatic mode. This wonder weapon was developed to allow infantry to dramatically increase their rate of fire while on the move, while also allowing the rifle to be used in conventional bolt action mode for long-range fire from the trenches.